Yes, shade can be a problem because there are a number of individual solar cells within a solar panel that need to be expose fully to sunlight. This is mainly because of the way the wiring of the solar panels are designed. So for example if there were ten individual solar cells and due to shading, one of the cells did not receive sunlight exposure, this will affect the power output of the nine other individual cells, even if the rest may be fully exposed to sunlight. That is why the angle of the solar panels are crucial because solar panels work optimally when each individual cell is exposed fully to sunlight.
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